A photon and an electron (mass *m*) have the same energy *E*. The ratio ( ) of their de Broglie wavelengths is: (*c* is the speed of light)

NEET UGPhysicsModerateNEET 2025

A photon and an electron (mass m) have the same energy E. The ratio ( $\lambda_{photon}/\lambda_{electron}$ ) of their de Broglie wavelengths is: (c is the speed of light)

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Sol. For photon,

E = \frac{hc}{\lambda_{Ph}} \Rightarrow \lambda_{Ph} = \frac{hc}{E}

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